In Reviewing a Patient's APTT Result, the Clinical Laboratory Professional

question 26

Multiple Choice

In reviewing a patient's APTT result, the clinical laboratory professional notes the presence of a delta flag.The patient's current APTT is 54 seconds, while the previous APTT (24 hrs ago) was 31 seconds (Note: QC was acceptable for both runs) .Which is the most appropriate action?

• A) Report the APTT since QC was acceptable.
• B) Check the sample for the presence of clots.
• C) Repeat APTT using a different methodology.
• D) Perform a mixing study procedure on the sample.

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Definitions:

Incomplete Dominance

A genetic phenomenon where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes.

Recessive

A genetic trait that is expressed only when two copies of the gene carrying the trait are present, as opposed to a dominant trait where only one copy is necessary.

Phenylketonuria

A genetic disorder characterized by the body's inability to break down the amino acid phenylalanine, leading to harmful buildup.

Recessive Gene

A gene that expresses its phenotypic trait only when homozygous, as its effect is masked by a dominant gene when heterozygous.