Epidemiology word problem help!?

The prevalnce of undetected diabetes in a population to be screened is approximatley 1.5% and it is assumed that 10,000 people will be screened. The screening test will measure blood serum glucose content. A vaule of 180 mg% or higher will be considered positive. The sensitivity and specificity associated with this screening are 22.9% and 99.8% respectively
what is the predicitve value of a positive test?
what is the predicitive value of a negative test?

True Positives (TP) = .229 x 150 = 34.35 or 34, because
Sensitivity = .229 = TP/(TP+FN) = TP/(150); 150 is the total # actually with diabetes; so
FN = 150-34= 116

True Negatives (TN) = .998 x 9850 = 9830, because
Specificity = .998 = TN/(TN+FP) = TN/9850 & 9850 is all the people who don’t have diabetes; so
FP = 9850-9830 = 20

So Positive Predictive Value (PPV) = TP/(TP + FP) = 34/(34+20) = 63%
And Negative Predictive Value (NPV) = TN/(TN+FN) =9830/(9830+116) = 98.8%

Please doublecheck but looks right to me

Hometesting diabetic cat’s blood glucose