A Blood Sample from a 90-Year-Old Man Was Submitted to the Blood

question 4

Multiple Choice

A blood sample from a 90-year-old man was submitted to the blood bank for a type and screen before surgery.The forward type demonstrates as a group A,whereas the reverse type appears to be group AB.What is the most likely cause of the discrepancy?

• A) Contaminated reagent antisera
• B) Rouleaux formation
• C) That the patient has autoantibodies
• D) That patient has low-titer isoagglutinins

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Definitions:

Bonds

Long-term instruments of debt issued by corporations or governments, promising to pay back the principal along with interest at a future date.

Equity Securities

Financial instruments that represent an ownership interest in a company, such as stocks.

Money-Market Funds

Investment funds that invest in short-term debt securities with the goal of providing high liquidity and low risk.

Treasury Bills

Short-term government securities with maturities of one year or less, used as a tool for managing short-term liquidity.