Different interference factors have different effects on the specific density results of the above three methods:
The first is that when the non-ionic compounds in urine increase, the specific density measured by suspension method and refractometer method will be higher, while the test strip method is only related to the ion concentration and is not affected by it;
The second is that when the urine protein increases, the three methods all have different degrees of increase, especially the test strip method, followed by the refractometer method;
Thirdly, the test strip method is susceptible to the influence of pH. when the pH of urine is more than 7, 0.005 should be added to the determination results as compensation for the loss of urine pH.