A/G Ratio Blood Test: Albumin, Globulin, and Context

Albumin is a major blood protein made by the liver. Globulins are a broader group of proteins with several functions, including immune roles. A total-protein panel measures the combined amount, and many laboratories derive globulin by subtracting albumin from total protein before calculating the ratio.^{See reference 1,See reference 2,See reference 3}

Read albumin, globulin and total protein on the same report. A ratio hides their separate magnitudes: it can change because albumin moved, globulin moved, or both did. A calculated value also carries uncertainty from the measurements used to derive it.^{See reference 1,See reference 2,See reference 3}

A lower ratio may reflect less albumin, more globulin or both. Liver or kidney conditions, inflammation and some immune conditions are among the possible contexts described for abnormal protein results. These possibilities are not diagnoses that can be made from the ratio.^{See reference 1,See reference 2}

The useful follow-up question is which component is outside its interval and whether the finding fits symptoms, other blood or urine results, medicines and previous values. A clinician may choose further testing based on that wider picture.^{See reference 1,See reference 2}

A higher ratio can reflect relatively more albumin or less globulin. Dehydration can concentrate blood proteins, while a low globulin result has its own possible explanations. The ratio alone cannot distinguish these situations or establish a cause.^{See reference 1,See reference 2}

Do not compare a single ratio with a universal number from the internet. Laboratories may calculate globulin differently, and the interval on the complete report is only one part of interpretation.^{See reference 1,See reference 2,See reference 3}

Keep the albumin, globulin, total protein and A/G results together, including their units and laboratory intervals. Compare dates, the reason for testing and any recent illness or major fluid change. Repeating or investigating a result is a clinical decision, not a response to a ratio in isolation.^{See reference 1,See reference 2}

If you feel unwell or a result is unexpectedly far from your usual pattern, ask your care team how soon it needs review. This page cannot judge urgency or replace an assessment.^{See reference 1,See reference 2}