I have seen wine poured to various amounts in a wine glass; what amount is generally considered standard...4 oz, 6 oz, 8 oz?
It comes from two different measurements, typical wine bottle size, and government alcohol regulations
Typical wine bottles are 750 ml, and this divides exactly into five or six servings of 150 or 125 ml (thanks peter). So many traditional wine glass serves are "exactly" 150 or 125 ml (~5 or 4 oz) depending in which country you live in
For typical government regulation, a standard drink is; a 100 ml glass of table wine, or a 330 ml can of beer, or a 30 ml glass of straight spirits. Each of these contains on average 10 g of alcohol. So many liquor licensing guidelines recommend the serving of wine by 100 ml (3.5 oz) standard drink sizes
Governments will use this to produce such amazing guidelines such as:
In most western countries the standard drink range is from 8 to 12 g of alcohol, except in the USA where it is super-sized to 14 g
Update; references from ICAP
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Wine glass question is a good one - in UK its either 175ml or 125 ml and confusion reigns, as bars will happily serve you a 250 mil and charge the large glass price! I would tend to believe 175ml in reaturants and 125ml for medical advice.
Doctors advice to drink one glass of wine a day is not really that clever - have you ever found a wine that is good on its fifth day of being open? (Apart from fortified ones - maybe there's the answer)