Use Phenyl Tyrosine Ratio when you need to compute the phenylalanine to tyrosine concentration ratio in micromoles per litre. Enter Phenylalanine and Tyrosine using the definitions and units below so the result can be reproduced.

Phenylalanine

A finite measured or assumed value greater than or equal to 0, expressed in umol/L.

Tyrosine

A finite measured or assumed value greater than or equal to 5e-324, expressed in umol/L.

The published tool contract uses this rule: Compute the phenylalanine to tyrosine concentration ratio in micromoles per litre.

Phenylalanine to tyrosine ratio

The calculated phenylalanine to tyrosine ratio.

A ratio or percentage can conceal the scale of its numerator and denominator and becomes sensitive to measurement error when the denominator is small.

Retain the original Phenylalanine and Tyrosine values and their units alongside the result. BUN Creatinine Ratio is useful when you instead need to compute the blood urea nitrogen to serum creatinine ratio. Corrected Calcium provides another view by helping you adjust measured calcium for hypoalbuminemia with the 0.8 correction.

• BUN Creatinine Ratio

  Compute the blood urea nitrogen to serum creatinine ratio.

• Corrected Calcium

  Adjust measured calcium for hypoalbuminemia with the 0.8 correction.

• Corrected Sodium

  Correct measured serum sodium for hyperglycemia with the 1.6 per 100 mg/dL rule.