9. The Coombs' test:
| a. | the direct test detects maternal IgM on fetal cells | |
| b. | is used in the investigation of thrombocytopenia | |
| c. | is positive in the baby with jaundice due to spherocytosis | |
| d. | the indirect test is used to detect antibodies in the maternal serum during pregnancy | |
| e. | the direct test uses anti-IgG serum |
| Answer |