Here is a basic test you can try right away. It is simple, and can be practiced until you know you have the "feel."
Directions for the subject: Extend your arm out sideways from the shoulder at an angle a little above 90 degrees. Find the comfortable "shelf" -- an easy muscle lock that holds the arm up. Keep wrist and hand straight, not limp. The tester will give a firm but gentle press. Don't fight by pushing upward; just keep the lock and resist the downward push. The other hand rests on your stomach.
Directions for the tester:
Stand behind the subject.
Rest a hand on the subject's shoulder of the arm
not raised. With your other hand touch the raised wrist without leaning or pressing. Warn the subject, saying something like "Ready? Resist!" Then press firmly but not suddenly for about a second, and feel for the resistance, and find that shelf that holds the arm up. Don't press so hard that the arm is forced down. You want to feel for the shelf, that comfortable stopping point, where the lock is firm. Everyone should stay fresh and comfortable, no exhaustion or muscle strain.
An empty hand on the subject's stomach measures baseline muscle strength. The subject's hand holding a substance against the stomach tests the substance. The tester compares the muscle resistance of the two attempts. Is the muscle weaker? Is the "shelf" gone, leaving the outstretched arm to buckle completely with the same pressure? The weakness in the arm indicates the amount of weakness for that substance. When I tested allergic, my muscle disappeared. It felt so strange to have my arm drop, as if I weren't ready for the push. But a repeat of the baseline for strength reassured us the results were real.
Because this process measures the subtle energy field around the body, it can be influenced by strong negative energy. A tester biased against the substance ("that milk must be bad for her") could cause a false "weak." When you test, try to just feel the shelf and not think too much about it.
You can get control of an allergic situation and start your own miracles.