Blood donation, explained plainly.

Artificial Oxygen Carriers: Can Anything Substitute for Red Cells?

Artificial blood alternatives: perfluorocarbons, haemoglobin-based carriers, freeze-dried plasma and enzyme-converted blood, and what they can't do.

Blood Banks in India: A Short History of Scandal, Reform and Progress

The history of blood banking in India: paid donors, the HIV scandal, the 1996 Supreme Court reforms, e-RaktKosh, and the voluntary donor gap.

Blood Storage Explained: Why Red Cells Chill, Platelets Wiggle and Plasma Freezes

How donated blood is stored: red cells at 2-6°C, platelets at room temperature with agitation, plasma frozen, and why the cold chain is unbreakable.

Blood transfusion, explained for patients and families

What a blood transfusion is, which component your relative actually needs, how safety is ensured, and what families in Assam should arrange, plain language, national standards.

Can Blood Be Manufactured? The Honest Science

Can blood be manufactured in a factory? An honest look at why no machine makes whole blood, what science is trying, and why donors still matter.

Cryoprecipitate and Albumin: The Lesser-Known Gifts Inside Plasma

Cryoprecipitate and albumin explained: the lesser-known blood products made from plasma, who needs them, and why every dose begins with a donor.

e-RaktKosh, how to check blood availability yourself

The government's national blood stock platform, and how to use it before you travel to any bank.

Emergency blood support in Assam, what to do, in order

Someone needs blood now. The ordered checklist: hospital first, official availability, then our donor request network.

How to donate blood in Assam, the complete 2026 guide

Where to go, what to carry, what it costs (nothing), and how the register alerts you when your group is needed.

How to organise a blood donation camp in Assam

For colleges, clubs, companies and community groups, the practical steps to run a camp with a licensed centre.

Lab-Grown Red Blood Cells: Promising Science, Distant Reality

Lab-grown red blood cells: small early trials have been reported, but can stem-cell-derived blood ever replace donation? The promise and the reality.

Platelet donation in Assam, dengue season, cancer care and how it works

Why platelet demand spikes every monsoon, why platelets can't be stockpiled, and how platelet donation differs.

The History of Blood Transfusion: From Desperate Experiments to Modern Medicine

From bloodletting to blood banks: the surprising, sometimes dangerous history of transfusion, from Landsteiner's 1901 discovery to modern India.

The Journey of a Blood Bag: From a Donor's Arm to a Patient's Vein

Follow a single unit of donated blood through registration, testing, separation, storage, crossmatch and transfusion, the full journey explained.

Universal donor blood, the science trying to make type O obsolete

Can science convert any blood into type O? Enzyme conversion research, lab-grown cells and synthetic carriers, what's real, what's experimental, and why donors still matter.

Voluntary vs replacement donation, the stat that explains Assam's blood problem

Most of Assam's blood comes from patients' own families. Here's why that's a problem and what changes it.

What blood costs in India, and why donation is free

Is blood free in India? Donating is always free; licensed centres may charge regulated processing fees. The voluntary-vs-replacement system and the illegal blood trade, explained honestly.

What happens to your blood after you donate

From couch to patient, the testing, grouping, separation and cold chain every unit passes through.

Where to donate blood in Assam, centres, camps and your district

The three places donation happens, and how to find the one nearest you right now.

Why Blood Expires: The Race Against Time Inside Every Blood Bank

Why blood expires: the shelf life of red cells, platelets and plasma, what happens to expired units, and why regular donors beat any stockpile.

Why monsoon is blood-donation season in Assam

Floods, dengue and cut-off roads, why the state's hardest months for blood are June to September.

Alcohol, smoking and blood donation, the honest rules

No alcohol for 24 hours before donating. Smoking doesn't disqualify you. Drugs: declare. The questionnaire exists to protect you and the patient.

Blood disorders, explained, anaemia to thalassemia, sickle cell and more

The major blood disorders in plain language, anaemia, thalassemia, sickle cell disease, haemophilia, leukemia, dengue's platelet effect, what patients need, and why regular voluntary donors matter for every single one.

Blood donation and exercise, the gym, running and rest

Walk after donating; skip the heavy gym for a day. How to plan workouts around donation, and why athletes make excellent regular donors.

Blood donation side effects, the honest list

What is normal after donating (dizziness, bruising, soreness) how to care for each, and the signs that need medical attention.

Blood group inheritance, how ABO and Rh actually work

Why blood groups exist, how a child's group is decided from the parents', where negative groups come from, and the rare Bombay blood group. Plain-language genetics.

Bone marrow, the factory inside your bones

How bone marrow makes billions of blood cells daily, what raw materials it needs, and why blood donation never leaves you 'running empty.'

Bruising after blood donation, what it is and what to do

Why a bruise forms at the needle site, how to care for it, how long it lasts, and the rare signs that need a doctor.

Haemoglobin and anaemia, the 12.5 rule, iron, and donating

What haemoglobin does, why India's donor cutoff is 12.5 g/dL, how to read a low-Hb result, and how vegetarians keep iron up. Plain language, NBTC-aligned.

How much blood does a human have?

The average adult has about 5 litres of blood, here's how that's calculated, why donation is safe, and where the 50 kg weight floor comes from.

Is blood donation safe?

Yes, for healthy adults under standard eligibility rules. What actually happens to your body, and the safeguards that protect donors.

Plasma, the liquid that carries everything

What blood plasma is, the proteins it carries, why frozen plasma lasts up to a year, and who depends on it, from burn victims to liver patients.

Platelets, the emergency repair crew

What platelets are, how clotting works, why they last only five days in storage, and why dengue season makes platelet donation vital in Assam.

Red blood cells, the oxygen couriers

What red blood cells do, why their shape and haemoglobin matter, how long they live, and why they're the heart of every blood transfusion.

What happens when you lose blood?

From a nosebleed to a serious injury, how your body responds to blood loss, when it becomes dangerous, and why a 450 ml donation is the safe end of the spectrum.

What is blood? The complete biology, in plain language

What blood is made of, what each component does, how your body makes it, and why understanding this makes you a better donor. NBTC-aligned, plain language.

When to seek medical help after donating blood

The clear red-flag list after blood donation, bleeding that won't stop, spreading swelling, fever, fainting, chest symptoms, and where to go.

White blood cells, your immune army

Meet neutrophils, lymphocytes, monocytes, eosinophils and basophils, and find out why donated blood is filtered to remove most white cells.

Why is blood red? (And why do veins look blue?)

The physics and chemistry of blood colour, haemoglobin and iron, bright vs dark red, why veins look blue, and the one animal with truly blue blood.

After donating blood, recovery and next steps

Water, snack, no heavy lifting for a day. What's normal, what's not, and when you can donate again.

Before donating blood, your simple checklist

Eat normally, drink water, sleep well, bring ID. What to do (and skip) in the 24 hours before donation.

Blood donation myths, busted

Weakness? Women can't donate? Vegetarians can't? Blood gets sold? The twenty biggest myths in Assam and India, answered honestly with national standards.

First-time blood donor? Everything you're wondering

It hurts for one second. You won't get weak. Yes, even you can do it. A first-timer's honest guide.

How blood donation works, step by step

Exactly what happens from walking into a blood centre to walking out, in about 45 minutes.

Students and young donors, the campus guide

18 and healthy? Campuses are where Assam's donor culture is built. What first-time young donors should know.

The recovery timeline, what your body replaces, and when

Plasma in 24–48 hours, platelets in weeks, red cells in weeks 3–6. An honest hour-by-hour and week-by-week map of post-donation recovery.

What happens during blood donation, minute by minute

From the door to the juice and biscuits: a minute-by-minute walkthrough of a full blood donation visit, so nothing surprises you.

What to bring to a blood donation

Photo ID, water, and sleeves that roll up, the short, honest list of what to bring (and what you don't need) on donation day.

What to eat before donating blood

Iron, vitamin C, water, the food choices that make your donation smooth and keep your haemoglobin up.

Why some people faint at blood donation (and how staff prevent it)

Fainting at donation is usually the vasovagal reflex, not blood loss. Why it happens, who's prone, and how staff handle it in minutes.

Women and blood donation, the honest answers

Yes, women donate. Intervals, haemoglobin, menstruation, pregnancy, what national guidance actually says.

A negative blood group, rare and far-reaching

A− is found in under 1 in 100 Indians, yet its red cells help four patient groups. What A− means, who it saves, and why banks never have enough of it.

A positive blood group, the quiet workhorse

A+ is found in roughly 1 in 5 Indians. Who A+ red cells help, who can give to A+, the plasma note, and why routine demand makes A+ donors essential year-round.

AB negative, the rarest of the eight

AB− appears in roughly 1 in 250 Indians, and its donors are special twice over: rare red cells for rare patients, and universal plasma for everyone else.

AB positive, the universal recipient, and plasma's universal donor

AB+ is found in roughly 1 in 13 Indians. Its red cells fit only one group, but AB plasma fits everyone. The inversion that makes AB donations special.

B negative blood group, scarce where demand never stops

B− is found in roughly 1 in 90 Indians while B-group demand is enormous. The double squeeze on India's B− supply, explained plainly.

B positive blood group, the Asia story

B+ is one of India's most common groups (roughly 1 in 3 people) far more than in the West. The population genetics, who B+ helps, plasma inversion, and why demand is constant.

O negative blood group, the universal red cell donor

O− is the universal red cell donor: no A, B or D antigens, fits every patient in an emergency, and is always in shortage. Why O− matters, myths, and who can give to whom.

O positive blood group, India's backbone

O+ is the most common blood group in India, roughly 1 in 3 people. Who O+ red cells help, who can give to O+, why it isn't universal, and why demand never stops.

Rare blood groups in Assam, why negative donors matter most

O negative, A negative, B negative, AB negative, the groups banks always run short of, and why registers matter.

Rare blood types, Bombay phenotype, Rh-null and the registries that find them

What makes a blood type genuinely rare: Bombay phenotype, Rh-null golden blood, Kell-Duffy-Kidd combinations, and why rare donor registries matter.

The Rh factor, the + and − behind your blood group

What the Rh factor actually is, why Rh− donors matter so much, weak D, anti-D in pregnancy, and the emergency rules that keep patients safe.

Why is it called Rh? The rhesus monkey story

How blood research on rhesus macaques in 1937–1940 gave the Rh factor its name, explained transfusion reactions, and led to anti-D's lifesaving discovery.

Blood donation eligibility in Assam, the complete checklist

Full eligibility rules for donating blood in Assam, including intervals, deferrals and what disqualifies you.

Cold, fever, infection, when sickness delays your donation

Fever needs about 2 weeks after recovery. Antibiotics, 5–14 days after the course. Why sick-day blood is never accepted, and when to come back.

Deferred from donating? Here's what it means

Most deferrals are temporary. What to do after common deferrals and when you can return.

Diabetes, blood pressure and medication, can you still donate?

Well-controlled diabetes, blood pressure and thyroid conditions are commonly acceptable for blood donation. What the centre checks, and why declaring everything matters.

Donating blood after a tattoo or piercing

Got a tattoo or piercing? The standard wait is 6 months, once fully healed. Why the rule exists, what counts as healed, and how to donate freely after.

Donating blood after surgery or dental work

Healing comes first. Major surgery commonly means months before donating; dental work ranges from same-day cleaning to days after an extraction.

Donating blood after vaccination

Most routine vaccines, including COVID-19 shots, need only 24–48 hours before you can donate. Which vaccines need longer, and why honesty at the checklist matters.

How often can you donate blood?

Men every 3 months, women every 4, why the interval exists and how we enforce it for you.

Travel and blood donation, why 'where have you been?' matters

Recent travel can affect donation because of infections carried without symptoms, malaria above all. What the questionnaire asks, and how Assam fits in.

Under 50 kg, why the scale says wait

The 50 kg minimum isn't bureaucracy, the donation volume is calibrated to body weight, and below 50 kg the safe draw is too small to process.

Who can donate blood in India, the basic rules

Age, weight, haemoglobin and health requirements per national standards, in plain language.

Antigens and antibodies, the two words that explain blood types

What antigens and antibodies really are, why your plasma attacks blood groups you lack, and how two words unlock every blood compatibility rule.

Blood typing, step by step, how your group is determined

How a lab finds your blood group: forward and reverse grouping, Rh and weak-D testing, repeat checks, and why a wrong label is a real emergency.

Emergency blood, why trauma teams don't wait for your group

Why unknown-group trauma patients get O negative blood first, how massive transfusion protocols work, and why the lab types while O− is running.

How blood compatibility actually works

Why blood types can't mix, what the antigens and antibodies are doing, and why the crossmatch (not the chart) gives the final word. Plain language.

Red cells vs plasma, the compatibility flip that surprises everyone

AB is the universal red-cell recipient but the universal plasma donor. O is the opposite. Why one donation carries two opposite compatibility rules.

The crossmatch, the final check before any transfusion

What a crossmatch test is, major versus minor, the computer crossmatch, type and screen, how long it takes, and what incompatible results mean.

What happens in an incompatible transfusion, and why it's almost impossible by design

The science of a transfusion reaction, the bedside warning signs, the stop-first protocol, and the layered checks that make mismatches rare.

Blood groups in pregnancy, ABO, testing and transfusions

Why every pregnancy starts with a blood group test, what ABO incompatibility means (and why it's milder than Rh), and when transfusion happens during pregnancy.

Can blood transfusions transmit disease? The testing, honestly

Every unit in India is tested for HIV, hepatitis B and C, syphilis and malaria. How testing works, what the real residual risk is, and why voluntary donors are the safest donors.

Massive transfusion and trauma, when a body needs blood at scale

What massive transfusion protocols are, how blood loss staggers the body, why O− units and balanced component packs exist, and where registers fit into disaster readiness.

Rh incompatibility in pregnancy, anti-D and why it matters

When an Rh− mother carries an Rh+ baby: sensitisation, haemolytic disease of the fetus and newborn, and how anti-D injections prevent it. Plain language.

Transfusion reactions, what can happen, and how staff watch for it

The kinds of transfusion reactions (fever, allergic, haemolytic, delayed) why most are mild and manageable, and how the system catches the rare serious ones early.

Haemophilia, when blood can't clot, explained

What haemophilia A and B are, why it mostly affects boys, how factor replacement therapy works, and why it is nothing like an ordinary blood transfusion.

Sickle cell disease, misshapen cells, and why donors matter

What sickle cell disease and trait mean, the pain crises, who it affects in India, transfusion's role, and why regular voluntary donors are part of care.

Thalassemia, the transfusion-calendar life, explained

What thalassemia major means, why patients need red cells every 2–4 weeks for life, iron overload and chelation, carrier screening, and the Assam context.