It would be unsurprising if the albumin level turned out to be low, if the A/G ratio was slightly off despite the normal-looking total protein values, etc.
As SirTruffleberry said, this situation would be a place where having long-term trends could help.
In a later comment, the original poster said that the Total Protein seemed fine. Unfortunately, https://www.ajkd.org/article/S0272-6386(99)70278-7/fulltext suggests that the person looking at the labs would have to know that they ought to look closely at the albumin level, specifically. It wouldn’t be the first time that ”Reality has a surprising amount of detail” where overlooking 1 thing is enough to get into trouble.
It would be unsurprising if the albumin level turned out to be low, if the A/G ratio was slightly off despite the normal-looking total protein values, etc.
As SirTruffleberry said, this situation would be a place where having long-term trends could help.