My question is how does one value go down while the other goes up and which test is the more important.l have Glomerulonephritis.

Ask your internist or nephrologist. THEY are the ones qualified to answer your questions as they relate to your overall history and present condition, not those of us on YA.

You need to take into consideration that all tests even if done within hours of each other may have slightly different results. Those results seem pretty darn close to each other as creatinine and blood urea nitrogen go.