Blood test

I had blood test. I got letter with answer that they found low white blood cels. I have to do again. I was reading that immune system is weak. Is it true?
@Stumbler

Hi @alesia_poilova_madni , swimming is the best exercise by far. It is low impact, as your body is buoyant and the water prevents the body over heating. Even aqua-aerobics for the same reasons.

@Alesia_Poilova_Madni

I had blood test. I got letter with answer that they found low white blood cels. I have to do again. I was reading that immune system is weak. Is it true?