No fasting is needed for either. Call 8872524007 to tell us which one your doctor has written.
What the Coombs test checks
Both versions use an antihuman globulin reagent, named after Robin Coombs, who described the method in 1945. It links antibody-coated red cells together so the clumping becomes visible.
- Direct Coombs (DCT/DAT): your own washed red cells are mixed with the reagent. Clumping means your cells are coated with antibody or complement.
- Indirect Coombs (ICT/IAT): your plasma or serum is incubated with test red cells, then the reagent is added. Clumping means antibodies are present in your blood.
The result is graded from negative to 4+. Where antibody identification or a titre is needed, the sample may be processed at a partner reference laboratory; we'll tell you when you book.
Why your doctor may order it
Direct test: - anaemia with jaundice, where autoimmune haemolysis is suspected - a newborn with jaundice whose mother is Rh negative or group O - a suspected transfusion reaction, or haemolysis linked to a medicine
Indirect test: - pregnancy in an Rh-negative mother, often repeated during the pregnancy - antibody screening before a transfusion - a woman with a previous baby affected by haemolytic disease
How to prepare
No fasting. Tell us if you've had anti-D injection in pregnancy, a transfusion in the past three months, or a new medicine recently. Anti-D can make the indirect test positive for weeks, and that's expected, not a new problem.
Sample type and report time
The direct test uses blood in a purple-top EDTA tube. The indirect test uses a plain (red-top) tube for serum, or EDTA in some labs. For pregnancy, your blood group report is useful to bring along. Home sample collection is available. Reports are usually ready the same day or the next day.
Understanding your results
A negative result means no antibodies were detected by the method used. A positive direct Coombs can be associated with autoimmune haemolytic anaemia, haemolytic disease of the newborn, a transfusion reaction or drug-induced haemolysis. Some healthy people have a weakly positive DAT with no haemolysis at all.
A positive indirect Coombs means a red cell antibody is present. In pregnancy the doctor will want to know which antibody it is and, for some, its titre over time. Your doctor reads the result alongside your symptoms and other tests, often including haemoglobin and bilirubin.
FAQ
What is the difference between direct and indirect Coombs?
Direct looks at antibodies on your red cells. Indirect looks for antibodies in your plasma.
Why is an indirect Coombs test done in pregnancy?
In an Rh-negative mother it checks whether she has made antibodies against Rh-positive cells. This guides her doctor's care for the baby.
Is there a Coombs test near me in Banur?
Yes. For a Coombs test near me in Banur, Alpha Laboratory collects the sample at the lab or during a home visit.
Can a positive Coombs test be harmless?
Sometimes. A weak positive without haemolysis is seen in some healthy people, and anti-D injection explains a positive indirect test. Your doctor will interpret it.
Book at Alpha Laboratory
For a Coombs test in pregnancy, bring your blood group report and antenatal card if you have them. Call 8872524007, WhatsApp us, or use the form on the contact page.