It can be spelled as either non tender or non-tender
Both are correct
Confirmatory Tests vary, and may be wrong from time to time. As time passes, the test is not as reliable as stated. If the so called "blood" is on a leather surface, blood isn't too prone to sticking to leather, so it may (or may not) be blood.
In my opinion I’m mostly recommended that it’s true ?
What is my blood pressure?
What should my blood pressure be?
What kind of diet should I follow to help control my blood pressure?
How much should I weigh?
Can you recommend a diet or eating plan to help me reach that weight?
How much exercise should I be doing?