You can use a strip. Wipe carefully with a wet wipe, use a tampon, wipe again, and do clean catch.
Disregard red blood cells (RBCs) or blood on the strip indicators. White blood cells (WBCs, leucocytes) are a little more useful in this context but not diagnostic, as the more blood in the sample, the higher the WBCs. The presence of bacteria can be helpful but is also affected by how contaminated the sample may be.
The most useful to you will be urinary nitrites and leukocyte esterase. Likelihood of a UTI goes up if either or both positive -- neither is affected by menses. Nitrites indicate the presence of gram-negative bacteria (e.g., E. coli), and LE looks for activated white blood cells (producing an enzyme).
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