lbs is an abbreviation already, and doesn't get abbreviated further; it is max abbreviated. It stands for the unit of weight 'pound'.
You can abbreviate 5500 pounds as "5500 lb" or "5.5k lb," where "lb" stands for pounds. The "k" in "5.5k" indicates thousands. Both forms are commonly used in contexts where space is limited or for easier reading.
8lb 10oz
6 lbs 11.9 oz
The abbreviation for "pounds" is "lbs" and for "ounces" it is "oz". Therefore, you could abbreviate "6 pounds 13 ounces" as "6 lbs 13 oz" for a baby's gift.
i abbreviate it as advs. You could also abbreviate it as adv.
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In medical terms you can abbreviate it to "Tx" like you abbreviate History to "Hx"
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You cannot abbreviate the number.