Question

based on the results of the following secretor study, what is the persons most likely lewis phenotype? note: test was performed on a 30-year old, a-positive patient.

unknown | \\(a_1\\) cells | b cells | o cells le(a+) | o cells le(a-)
--- | --- | --- | --- | ---
saliva + anti-a | +
saliva + anti-b | | +
saliva + anti-\\(le^a\\) | | | 0 | 0
saliva + anti-h | | | + | +

• le(a-b-)
• le(a+b-)
• le(a+b+)
• le(a-b+)

Explanation:

Understand saliva inhibition testing

Using the Saliva Inhibition Test knowledge point

$$
LATEXBLOCK0
$$

Determine ABH secretor status

Using the ABH Secretor Status knowledge point

$$
LATEXBLOCK1
$$

Analyze Lewis antigen in saliva

Using the Saliva Inhibition Test knowledge point

$$
LATEXBLOCK2
$$

Determine Lewis phenotype

Using the Lewis Phenotypes knowledge point

$$
LATEXBLOCK3
$$

Answer:

• Le(a-b-)
• Le(a+b-) (Correct answer)
• Le(a+b+)
• Le(a-b+)