Well, you can't calculate an albumin-globulin ration without a number for globulin. It's like trying to calculate miles per gallon where you know how many gallons of gas you used, but you forgot to set the odometer the last time you filled up the tank.
What is considered "normal range" varies a tiny bit from lab to lab based on the equipment they use. At my lab, here are the normal ranges:
There is no lab in the world where the average A/G ratio is 13-72. A person with such a reading would not be alive to ask about it.
I think your lab report is just messed up. I would call the laboratory and ask them to explain such outrageous numbers.
It's the same thing with the BUN/Creatinine ratio. You can't have a ratio unless you have values for both BUN and creatinine. Normal levels at my lab are as follows;
As for what the tests mean, albumin and globulin are the two largest percentages of protein in the blood. The albumin-globulin ration is a calculated number that is related to the clotting ability of the blood. An albumin-globulin ratio of 13-72 would only be found in clotted blood. A person could not live with such numbers.
BUN is the acronym for blood urea nitrogen. If the number is XXXXX the kidneys may be having a problem filtering it out. However, it could also just mean that the person was dehydrated when the blood was drawn. Creatinine is another byproduct found in blood that the kidneys filter. A high level may also indicate dehydration or a kidney problem.
Reading blood test results is not just numbers but art. From the number part, one needs to understand that "average" captures just 2/3 of people. There will always be outliers on the low and high sides whose readings are perfectly normal for them, but are outside of the lab average. Therefore, a reading of 1.25 on a test whose lab normal range is 0.70 to 1.20 is nothing to be concerned about unless the provider has some other reason to suspect a problem. Normal procedure would be to recheck in 3-6 months.
A reading of 2 on an albumin/globulin ratio is normal. The lab normal range of 12-72 is just plain wrong. I would ask the lab in question to explain how such an error came about in the printout.
Please let me know if you have questions.
All the best,